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nil (value)
In the Lua language, the value nil is special and is to mean false, or the equivalent of a NULL pointer in the C language. The value nil is designed to be different from any other possible value.
Setting a table
or variable equal to nil to cause Lua to delete it from use
and collect its memory usage.
Returned values
can be tested for equality to nil.
Lua returns
nil for variables, functions, etc. that do not exist.